Medusa nebula, Abell 21

Noirlab_noaoann09008a_1024

noirlab_noaoann09008a April 21st, 2009

Credit: T. A. Rector/University of Alaska Anchorage and H. Schweiker/NOIRLab/NSF/AURA and NOIRLab/NSF/AURA

The Medusa nebula, known scientifically as Abell 21, is an old planetary nebula some 1,500 light-years away in the constellation Gemini. It is estimated to be over 4 light-years across. This image was taken on Oct 24th, 2008 at the Mayall telescope with the mosaic camera, with [OIII] (assigned a blue color) and H-alpha (orange) filters This image was released during the 100 Hours of Astronomy webcast, "Around the World in 80 Telescopes" held from April 3-4, 2009, during the International Year of Astronomy 2009. View the recorded event from KPNO. See also this image of NGC 6520 from CTIO, which was also released during the webcast.

Provider: NOIRLab

Image Source: https://noirlab.edu/public/images/noaoann09008a/

Curator: NSF's NOIRLab, Tucson, AZ, USA

Image Use Policy: Creative Commons Attribution 4.0 International License

Image Details

Image Type
Observation
Object Name
Medusa Nebula Sh 2-274
Noirlab_noaoann09008a_128
 

Position Details

Position (ICRS)
RA = 7h 29m 3.5s
DEC = 13° 15’ 16.2”
Orientation
North is 90.1° CCW
Field of View
36.0 x 35.9 arcminutes
Constellation
Gemini

Color Mapping

  Telescope Spectral Band Wavelength
Orange Nicholas U. Mayall 4-meter Telescope (Mosaic 1) Optical (Ha) 656.0 nm
Cyan Nicholas U. Mayall 4-meter Telescope (Mosaic 1) Optical (Olll) 499.0 nm
Spectrum_base
Orange
Cyan
Noirlab_noaoann09008a_1280
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ID
noaoann09008a
Subject Category
Subject Name
Medusa Nebula, Sh 2-274
Credits
T. A. Rector/University of Alaska Anchorage and H. Schweiker/NOIRLab/NSF/AURA and NOIRLab/NSF/AURA
Release Date
2009-04-21T00:00:00
Lightyears
Redshift
Reference Url
https://noirlab.edu/public/images/noaoann09008a/
Type
Observation
Image Quality
Distance Notes
Facility
Nicholas U. Mayall 4-meter Telescope, Nicholas U. Mayall 4-meter Telescope
Instrument
Mosaic 1, Mosaic 1
Color Assignment
Orange, Cyan
Band
Optical, Optical
Bandpass
Ha, Olll
Central Wavelength
656, 499
Start Time
Integration Time
Dataset ID
None, None
Notes
Coordinate Frame
ICRS
Equinox
J2000
Reference Value
112.264402797, 13.2544918006
Reference Dimension
8333.0, 8304.0
Reference Pixel
4166.5, 4152.0
Scale
-7.20585526014e-05, 7.20585526014e-05
Rotation
90.120000000000047
Coordinate System Projection:
TAN
Quality
Full
FITS Header
Notes
Creator (Curator)
NSF's NOIRLab
URL
https://noirlab.edu
Name
Email
Telephone
Address
950 North Cherry Ave.
City
Tucson
State/Province
AZ
Postal Code
85719
Country
USA
Rights
Creative Commons Attribution 4.0 International License
Publisher
NSF's NOIRLab
Publisher ID
noirlab
Resource ID
noaoann09008a
Metadata Date
2021-04-22T18:07:51.055479
Metadata Version
1.1
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Detailed color mapping information coming soon...

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There is no distance meta data in this image.